skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Analysis of Acoustic Emission Propagation in Metal-to-Metal Adhesively Bonded Joints

Abstract

Acoustic emission (AE) monitoring shows promise as one of the most effective methods for condition monitoring of adhesively-bonded joints. Previous research has demonstrated its ability to detect, locate and classify adhesive joint failure, though in these studies little attention appears to have been paid to the differences in AE wave propagation through the bonded and un-bonded sections of the specimens tested, or to the effects of the wave modes excited or the propagation distances. This paper details an experimental study conducted on large aluminium sheet specimens to identify the effects of the presence of an adhesive layer on AE wave propagation. Three specimens are considered; a single aluminium sheet, two aluminium sheets placed together without adhesive, and an adhesively-bonded specimen. A pencil lead break (PLB) is used as a simulated AE source, and is applied to the three specimens at varying propagation distances and orientations. The acquired signals are processed using wavelet-transforms to explore time-frequency features, and compared with modified group-velocity curves based on the Rayleigh–Lamb equations to allow identification of wave-modes and edge-reflections. The effects of propagation distance and source orientation are investigated while comparison is made between the three specimens. It is concluded that while the wave propagationmore » modes can be approximated as being constant throughout all three specimens, there is a significant change in the received waveforms due to the attenuation of high-frequency components exhibited by the bonded specimen. These findings may be utilised to provide a deeper understanding of acquired AE data, improving the current abilities to identify, locate and characterise damage mechanisms occurring within adhesive joints, ultimately improving safety in the use of adhesive bonding for critical applications.« less

Authors:
Publication Date:
OSTI Identifier:
22810057
Resource Type:
Journal Article
Journal Name:
Journal of Nondestructive Evaluation
Additional Journal Information:
Journal Volume: 37; Journal Issue: 2; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Article Copyright (c) 2018 The Author(s); http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0195-9298
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ADHESIVES; ALUMINIUM; BONDING; DISTANCE; MONITORING; ORIENTATION; WAVE FORMS; WAVE PROPAGATION

Citation Formats

Crawford, Alasdair, Droubi, Mohamad Ghazi, E-mail: m.g.droubi@rgu.ac.uk, and Faisal, Nadimul Haque, E-mail: n.h.faisal@rgu.ac.uk. Analysis of Acoustic Emission Propagation in Metal-to-Metal Adhesively Bonded Joints. United States: N. p., 2018. Web. doi:10.1007/S10921-018-0488-Y.
Crawford, Alasdair, Droubi, Mohamad Ghazi, E-mail: m.g.droubi@rgu.ac.uk, & Faisal, Nadimul Haque, E-mail: n.h.faisal@rgu.ac.uk. Analysis of Acoustic Emission Propagation in Metal-to-Metal Adhesively Bonded Joints. United States. https://doi.org/10.1007/S10921-018-0488-Y
Crawford, Alasdair, Droubi, Mohamad Ghazi, E-mail: m.g.droubi@rgu.ac.uk, and Faisal, Nadimul Haque, E-mail: n.h.faisal@rgu.ac.uk. Fri . "Analysis of Acoustic Emission Propagation in Metal-to-Metal Adhesively Bonded Joints". United States. https://doi.org/10.1007/S10921-018-0488-Y.
@article{osti_22810057,
title = {Analysis of Acoustic Emission Propagation in Metal-to-Metal Adhesively Bonded Joints},
author = {Crawford, Alasdair and Droubi, Mohamad Ghazi, E-mail: m.g.droubi@rgu.ac.uk and Faisal, Nadimul Haque, E-mail: n.h.faisal@rgu.ac.uk},
abstractNote = {Acoustic emission (AE) monitoring shows promise as one of the most effective methods for condition monitoring of adhesively-bonded joints. Previous research has demonstrated its ability to detect, locate and classify adhesive joint failure, though in these studies little attention appears to have been paid to the differences in AE wave propagation through the bonded and un-bonded sections of the specimens tested, or to the effects of the wave modes excited or the propagation distances. This paper details an experimental study conducted on large aluminium sheet specimens to identify the effects of the presence of an adhesive layer on AE wave propagation. Three specimens are considered; a single aluminium sheet, two aluminium sheets placed together without adhesive, and an adhesively-bonded specimen. A pencil lead break (PLB) is used as a simulated AE source, and is applied to the three specimens at varying propagation distances and orientations. The acquired signals are processed using wavelet-transforms to explore time-frequency features, and compared with modified group-velocity curves based on the Rayleigh–Lamb equations to allow identification of wave-modes and edge-reflections. The effects of propagation distance and source orientation are investigated while comparison is made between the three specimens. It is concluded that while the wave propagation modes can be approximated as being constant throughout all three specimens, there is a significant change in the received waveforms due to the attenuation of high-frequency components exhibited by the bonded specimen. These findings may be utilised to provide a deeper understanding of acquired AE data, improving the current abilities to identify, locate and characterise damage mechanisms occurring within adhesive joints, ultimately improving safety in the use of adhesive bonding for critical applications.},
doi = {10.1007/S10921-018-0488-Y},
url = {https://www.osti.gov/biblio/22810057}, journal = {Journal of Nondestructive Evaluation},
issn = {0195-9298},
number = 2,
volume = 37,
place = {United States},
year = {2018},
month = {6}
}